It should looks something like
Code:
<add name="SnitzConnectionString" connectionString="Data Source=SERVERNAME;Initial Catalog=DATABASENAME;IntegratedSecurity=true;" providerName="System.Data.SqlClient" />
If not using Integrated security then you will need to add the username/password to the string, like below
Code:
<add name="SnitzConnectionString" connectionString="Data Source=SERVERNAME;Initial Catalog=DATABASE;UID=USERNAME;PWD=PASSWORD;" providerName="System.Data.SqlClient" />
You shouldn't really be using the AttachDbFilename, that is meant for local databases rather than a full SQL instance
I would advise waiting until I post the latest code this evening as some bugs were fixed in the install process